Humidity Sensitive Switch Relay Module

The Humidity Sensitive Switch Relay Module is a ready-made humidity controller board that switches a relay when the moisture in the air passes a level you set. A resistive humidity sensor feeds a comparator circuit, and a potentiometer adjusts the trip point, so you can turn a fan, dehumidifier, humidifier or alarm on and off automatically without a microcontroller or any code.

Humidity Sensitive Switch Relay Module Specifications

• Sensor: resistive humidity sensing element on the board
• Control circuit: comparator with a potentiometer to set the switching threshold
• Output: relay contacts with NO (normally open), COM and NC (normally closed) terminals
• Use: works stand-alone, no programming needed

Humidity Sensitive Switch Relay Module Applications

• Switching bathroom or storeroom exhaust fans when humidity rises
• Controlling a dehumidifier or humidifier in rooms, cupboards and greenhouses
• High-humidity alarms for warehouses and equipment cabinets
• Incubator, terrarium and mushroom-growing projects
• STEM lessons on sensors and automatic control

What's in the Box

• 1 × humidity sensitive switch relay module

Tip: Check the coil voltage printed on the relay (5 V and 12 V versions of this board exist) and power the module to match. Turn the potentiometer slowly and wait a few seconds after each step, because the sensor reacts gradually. If you switch mains loads, stay within the relay rating and keep all mains wiring fully insulated.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.